Dental hand piece



May 15, 1945.

J. WAHLBERG DENTAL HANDPIECE Filed May 19, 1943 2 Sheets-Sheet lrra/waff);

May 15, 1945 J. WAHLBERG DENTAL HANDPIECE Fil'ed May 19, 1945 2Sheets-Sheet 2 INVENTOR #fsu/.4 .5E/@

A Arramvfy t Pateted May 15,1945

n UNITED John Wahlberg, New York, N; Y., assignor to Nat Chayes, Rye, N.Y.

`Arrlicatiml May 19, 1943s`efi'a1 Np. 487,831.

' `1` claim. (c1. snz-ze) The invention herein disclosed relates todental handpieces. i i i In .i handpieces of the lconventionaltype, the

` pulley which drives the spindleis mounted on and carried by thespindle. As a result, all vibration and unevenness occasioned `by themotor, guide pulleys, driving belt, etc., are directlytransmitted to thespindle. `The pressure of the belt `on the i pulleyqalso is applied totheV spindle, producing undesirable friction and wear., i n i Specialobjects of the present invention are to eliminate and avoid the aboveandother objections and to provide ahandpiecerinwhich the drill spindlewill be operated smoothlyand quiet'- ly, free of side thrust and lateralplay and which will be practical and desirable in other respects. `Otherobjects of the invention are vto provide ahandpiece structure which canbe readily taken apart, adjusted to take up play and otherwise used tobest advantage by the operator, all without requiring employment of anytools. `A further important object is to enableth ready change andsubstitution of` different forms of devices, such as contra angles andstraight `liandpieces in the same head structure, Without disturbing thedrive pulley, belt or other" parts.` s

Other desirableobjects will appear 'and the novel features by whichthepurposes of the in- `vention are attained are set forth in the followingspecification. Y v r i The drawings accompanying and forming part of thespecification illustrate certain present `preferred embodiments of theinventiombut struc-` ture may be modified and changed in respectlto' thepresent disclosure allwithinthextrue` intent and broad scope of theinvention as hereinafter dened and Claimed. f n

Fig. 1 in the drawings `is'a broken side elevation and part sectionalview of a present commercial embodiment of the invention.' i

Figt2 is` a broken side'view showing a contra angle substituted in placeof theistraight handpiece rstillustrated andA showing the couplingsleeve unlatched and drawn back as in releasing the attachment from theheadpiece.

Figs. 3 and 4 are broken sectional details of the spring latch,.Fig. 3being' a horizontal section takensubstantiallyon line 3-1-3 of Fig;.land Fig.

. 4 being a vertical sectional view. n

Fig. 5 is a broken plan view showing the spindle and associated partsseparated from the pulley `on the headpiece. i

Fig. 6 is an end view illustratingcoacting jaw clutch: elements on thespindleA and.` separately mounted pulley. y w1 1 Figs.` 7 and 8 aredetail views illustrating other forms of clutch constructions. .i n i il Figs. 9 and 10 are broken sectional details` il, lustrating` otherforms of `pulley structures. n Intheembodiments of the inventionillustrated, the main supporting structure, the headstock or -lieadlPortion ofthe device is in the forni of an upright pivotally mountedpost l5, enlarged orextendedat .the upper 'end into anarm or bracket.|6, carrying a horizontally extending sleeve or 4barrel I1, Thissupporting sleeve is shown` as having `an inwardly projecting annularflange I8, at one end and asbeing slotted inwardlyirom the opposite endat I9, into a transversely extending cam slot 2li.`

n `ixdju'stably andremovably mountedwithinthe supporting sleeve il, is a`bearing, sleeveZl, carv rying aradial clamp Ascrew having ashankportion 22, to enter slot I9, and pass into the inclined cani way 20,and a headportion 23, to clampingly engage the outer surface of thesupporting sleeve.

. The `,bearing sleeve has an easy sliding engagement in the supportingsleeve and-the screwen` gagingA in the cam slot, .provides a ready meansfor longitudinally, adjusting and securing the bearing sleeve inadiustedposition in `the sup,- portingsleeve. t n .n I ,n r

The pu1ley24 for driving the'spindle isrotat.- ably mounted upon theouterend of the bearing sleeve. i. i A

n In Fig. 1, themdrive pulleyis shown as of twopart construction, a mainpart 25, carrying the belt groove and `a complementary hub .part 26,screwed intothe `main` partat 21 both parts rotatably engaging over theend portion of Athe bearing sleeve 2|, and having thrust facesengageable with `(,)iposite )sides of 'the annular thrust shoulder 28onsaid sleeve. .A

The drive pulley is thus rotatably mounted on the headpiece orsupporting structure and `forms a unit with the bearing sleeve whichcarries it andwhich isv removably and longitudinally adjustable in theheadpiece. A

The spindleis indicated at` 29, as of `tubular one-piece construction,rotatably journalled at30,

in the bearing sleeve 2|, and having a thrust 001191 3l; engaging athrust shoulder 32, inthe bearing sleeve. i i

At the pulley end, the hollow spindle is `shown as extended and ashaving longitudinal grooves 33,formed therein. The pulleyis shown ashaving an annular ange 34, extended inwardly over the end of the bearingsleeve and having radially projecting lugs or teeth 35, slidinglyengageable in said spindle grooves.v i

:ail

is shown as internally screw-threaded at 36,

receive the similarly screw-threaded portion ,of

. the chuck closing rod 31, and the latter is" shovm' as having anexposed head portion3,8,; for operating the same and which is of lessdiameter than the inwardly projecting drive lugs, pf the pulley,

so as not to interfere With freevvithdraytal of' the' spindle from thepulley.

The chuck Closing rodl, is shown as engaging" eil-y een News' teeeniirie' nie' sem-'dief in The `sheath i's remoyajjclly;4 securedtofthe'helad- Pieceend, utilized t0 .hold the' ,spiedleln tSbeaI- le'db'l rtial, suppe ne. sieere aiigularly ,Bent portion 5 6, prqjeenng nireet into a receiver opening ,ilin the levefbr.A A s shown particularly@Fig ..4, tne aiigii1ajr1y be1ii-peririflgihe Spring has' Harige .thereit eaters theiopiriail. .ariisiiilndpwerdly t9. exert@ lifting. @Keet,the estive .eed .Qfhe

latch. This View also showswthednnerportion of.; the-.transversepassaselz. as enlargedatei. t0 i permit ireeaftionpfthe unsupported endportinfthebent Spring.. retainersleeve Q1: Ivins @his Shown aslongitudinally slotted at its inner endet 611 tqslidf mehr.4 creased.Aoverthe i. @des of the. supporting bracket..which ,thuis serves' asasilide to .dire-.Ct the: retainer. ,to vfully seated positicncn theheadand into interlocked engagement with: the spring catch.. i

. Att-he upper side, tli'er'etain'er sleeve is shfown as having a wideslot 6I, cut in the' inner'end of forr the 'bearing sleeve".

the same to expose the cam slot and adjusting and securing screw.

When the parts are assembled as in Fig. l, the sheath is rotatablyengaged over the end of the bearing sleeve and conned by the retainingsleeve against the end of the supporting sleeve. The sheath then can beused in the ordinary Way as a freely rotatable handle. This thrustbearing cngageijnenxtbetween the inner end ci the sheath and the'opposing end of the supporting head enables the sheath to form alongitudinal retainer for the spindle and the cam slot adjustment of thespindle bearing sleeve in the supporting head enables the endwise playof the spindle in the sheath t o be accurately set and adjustmentsquickly'made for any relative looseness or tightnessof the spindle inthe sheath. This adjustnintionce' made yneed not ordinarily bedisturbed, QXoept possibly as Wear occurs or as may be re- Aquired whendifferent parts are substituted in leased, the sheath and spindle can beentirely separated from' the supporting head, leavingA the drive pulleyon the head, journall'ed onlthe'fend er trieb-rearing sleeve'. Theiatterer anytime, either after removal of the sheath and' spindle, or,Without removal of the sheath and spindle, may be Withdrawn from theopposite end of the supporting sleeve,' upon simply looseningr the'adjusting screw and rocking it back so that' it: v'vill sii'peuuthrough' the ienginudinei entrance porn tion of the cam slot.

In vthe case of the' straight form of the tool illustrated in Fig; 1,'the spindle may be left in place"1 yinV the head when the sheath isremoved.

Inthe contra angle form of the tool shown` in ,remain connected with andbe removed bythe sheath; l

Figs.' 2' and 5' in particular, illustrate the ease with whicha straighthandpie'ce or a' contra an.- gl'e or the; like,-m`aybe= quicklyinterchanged one for the other onl the saine headpiece, withoutdisturbing the drive connections in any Way or any previous adjustmentthat may haveY been made If however, such'adjustments may be desirablein such substitution of parts; the same can be instantly made.

.The contra angle shown is unique in that' it is a complete 'handpiecewith the contra angle structure incorporated therein and carrying .itsown spindle, ready to slip intoclutched engagement with the'drive pulleyon the headpiece.

Instead of aV jaw clutch form of couplingbetween the pulley andremovable spindle as rst illustrated, other separable drive connectionsmay'. be employed; such as a simple squared or an'gledcross sectionshaft end as illustrated at driver for the spindlefalso' may be made upin` diierent forms and mounted in different ways. Thus, asv vshown in'Figui), the pulley may be made up in two parts 66, 61, secured togetherover the antiefriction bearing elements 68, riding the groovev in. aball-race sleeve, secured on the bearing sleeve at 10.

Fig. lillustrates a somewhat similar structure but involving a plainbearing. In this View, the pulley turns directly onabearing collar 1I,

fixed on the bearing sleeve at 12, being conned thereon by a splitflange or washer element 13, engaging a retainer groove 14, in thecollar.

What is claimed is: A dental handpiece, comprising a supporting head, aspindle journalled Within said head, a

sheath confining said spindle in position in the head, the head having aprojecting tubular'portion and said sheath being removably and rotatablyengaged over said tubular portion,` said sheath having an annular thrustflange, a retainer sleeve about said sheath and in thrust sleeve, saidhead having a passage therethrough for said spring Wire and said passagebeing smaller at the end where `said spring `Wire is supported toprovide a fulcrum for the same and larger at the opposite end to permitfree movementof that portion of the spring wire extending to the latchlever. p l n n i JOHN WAHLBERG.

